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| 型號： | TPA3120D2_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 25-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 25 W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 12/27頁 |
| 文件大小： | 631K |
| 代理商： | TPA3120D2_07 |
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APPLICATION INFORMATION
CLASS-D OPERATION
This section focuses on the class-D operation of the TPA3120D2.
Traditional Class-D Modulation Scheme
The TPA3120D2 operates in AD mode. There are two main configurations that may be used. For stereo
operation, the TPA3120D2 should be configured in a single-ended (SE) half bridge amplifier. For mono
applications, TPA3120D2 may be used as a bridge tied load (BTL) amplifier. The traditional class-D modulation
scheme, which is used in the TPA3120D2 BTL configuration, has a differential output where each output is 180
degrees out of phase and changes from ground to the supply voltage, V
CC
. Therefore, the differential prefiltered
output
varies
between
positive
and
negative
0 V across the load. The class-D modulation scheme with voltage and current waveforms are shown in
Figure 23
and
Figure 24
.
+V
CC
0 V
Output Current
Output Current
+V
CC
0 V
+V
CC
0 V
+V
CC
0 V
-V
CC
Differential Voltage
Across Speaker
Supply Pumping
One issue encountered in single ended (SE) class D amplifier designs is supply pumping. Power supply
pumping is a rise in the local supply voltage due to energy being driven back to the supply by operation of the
Class D amplifier. This phenomenon is most evident at low audio frequencies and when both channels are
operating at the same frequency and phase. At low levels, power supply pumping results in distortion in the
audio output due to fluctuations in supply voltage. At higher levels, pumping can cause the overvoltage
protection to operate, which temporarily shuts down the audio output.
TPA3120D2
SLOS507C–MARCH 2007–REVISED MAY 2007
V
CC
,
where
filtered
50%
duty
cycle
yields
Figure 23. Class-D Modulation for TPA3120D2 SE Configuration
Figure 24. Class-D Modulation for TPA3120D2 BTL Configuration
12
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| TPA3120D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3120D2 Evaluation Module RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA3120D2PWP | 功能描述:音頻放大器 25-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3120D2PWP | 制造商:Texas Instruments 功能描述:Audio Power Amplifiers |
| TPA3120D2PWPG4 | 功能描述:音頻放大器 25W Stereo Class D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3120D2PWPR | 功能描述:音頻放大器 25-W Stereo Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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